Beamformed channel busy ratio

ABSTRACT

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may measure a per-beam channel busy ratio (CBR) for each of one or more beams configured on the sidelink receiver for transmitting or receiving sidelink transmissions including a first CBR for a first beam that is to be used for receiving a sidelink transmission transmitted by a first sidelink transmitter; and may transmit an indication of the per-beam CBR. In some aspects, a user equipment may receive information associated with a per-beam CBR including a first CBR for a first beam to be used by a sidelink receiver for receiving a sidelink transmission transmitted by the sidelink transmitter, and may selectively transmit the sidelink transmission for reception by the sidelink transmitter using the first beam based at least in part on the indication of the per-beam CBR. Numerous other aspects are provided.

CROSS-REFERENCE TO RELATED APPLICATION

This is a continuation of U.S. patent application Ser. No. 16/900,463,filed Jun. 12, 2020, entitled “BEAMFORMED CHANNEL BUSY RATIO,” whichclaims priority to U.S. Provisional Patent Application No. 62/864,421,filed on Jun. 20, 2019, entitled “BEAM FORMED CHANNEL BUSY RATIO,” thecontents of which are incorporated herein by reference in theirentireties.

FIELD OF THE DISCLOSURE

Aspects of the present disclosure generally relate to wirelesscommunication and to techniques and apparatuses for beamformed channelbusy ratio (CBR)-based concepts for assessing channel use in a systemthat uses beamforming, such as a system that utilizes millimeter wave(mmW) communications.

BACKGROUND

Wireless communication systems are widely deployed to provide varioustelecommunication services such as telephony, video, data, messaging,and broadcasts. Typical wireless communication systems may employmultiple-access technologies capable of supporting communication withmultiple users by sharing available system resources (for example,bandwidth, transmit power, or the like, or a combination thereof).Examples of such multiple-access technologies include code divisionmultiple access (CDMA) systems, time division multiple access (TDMA)systems, frequency-division multiple access (FDMA) systems, orthogonalfrequency-division multiple access (OFDMA) systems, single-carrierfrequency-division multiple access (SC-FDMA) systems, time divisionsynchronous code division multiple access (TD-SCDMA) systems, and LongTerm Evolution (LTE). LTE/LTE-Advanced is a set of enhancements to theUniversal Mobile Telecommunications System (UMTS) mobile standardpromulgated by the Third Generation Partnership Project (3GPP).

The above multiple access technologies have been adopted in varioustelecommunication standards to provide a common protocol that enablesdifferent user equipments (UEs) to communicate on a municipal, national,regional, and even global level. New Radio (NR), which may also bereferred to as 5G, is a set of enhancements to the LTE mobile standardpromulgated by the 3GPP. NR is designed to better support mobilebroadband Internet access by improving spectral efficiency, loweringcosts, improving services, making use of new spectrum, and betterintegrating with other open standards using orthogonal frequencydivision multiplexing (OFDM) with a cyclic prefix (CP) (CP-OFDM) on thedownlink (DL), using CP-OFDM or SC-FDM (for example, also known asdiscrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink (UL),as well as supporting beamforming, multiple-input multiple-output (MIMO)antenna technology, and carrier aggregation. However, as the demand formobile broadband access continues to increase, there exists a need forfurther improvements in LTE and NR technologies. Preferably, theseimprovements are applicable to other multiple access technologies andthe telecommunication standards that employ these technologies.

In a wireless network, a sidelink can be, for example, a communicationlink between a UE and another UE, or a communication link between anintegrated access and backhaul (IAB) node and another IAB node. Thisdiffers from an access link, which is a communication link between a UEand a base station or a communication link between an IAB node and abase station. A wireless communication device (for example, a UE, an IABnode) that is to transmit a sidelink transmission is herein referred toas a sidelink transmitter, while a wireless communication device that isto receive a sidelink transmission is herein referred to as a sidelinkreceiver. Generally, when a sidelink transmitter needs to transmit asidelink transmission to a sidelink receiver, the sidelink transmittershould take into consideration how busy the channel is when determiningwhen/whether to transmit the sidelink transmission on the channel. Inorder to achieve this, the sidelink transmitter may be configured tomonitor a channel busy ratio (CBR) associated with the channel. A CBR isa measurement indicative of how busy a channel is and, therefore, mayindicate a probability of interference or a collision with anothertransmission on the channel.

In prior wireless communications systems in which CBR-based techniquesfor transmitting sidelink transmissions have been implemented, a CBR isdefined but does not address the concept of beamforming. Thus, in asystem that uses beamforming, such as a system that utilizes millimeterwave (mmW) communications, the conventional approach to using CBR isinsufficient for assessing channel use. For example, a first sidelinktransmitter that needs to transmit to a sidelink receiver may attempt tomeasure a CBR associated with a channel, but the first sidelinktransmitter may not be able to sense a transmission by a second sidelinktransmitter when a transmit beam used by the second sidelink transmitteris not aligned with a receive beam of the first sidelink transmitter. Inother words, the CBR measurement by the first sidelink transmitter maybe blind to the sidelink transmission from the second sidelinktransmitter, meaning that the CBR cannot be reliably used by the firstsidelink transmitter to assess how busy the channel is when determiningwhether to transmit the sidelink transmission to the sidelink receiver.

SUMMARY

In some aspects, a method of wireless communication, performed by asidelink receiver, may include measuring a per-beam channel busy ratio(CBR) for each of one or more beams configured on the sidelink receiverfor transmitting or receiving sidelink transmissions including a firstCBR for a first beam that is to be used for receiving a sidelinktransmission transmitted by a first sidelink transmitter; andtransmitting an indication of the per-beam CBR for each of the one ormore of the beams including the first CBR for the first beam.

In some aspects, a sidelink receiver for wireless communication mayinclude memory and one or more processors operatively coupled to thememory. The memory and the one or more processors may be configured tomeasure a per-beam CBR for each of one or more beams configured on thesidelink receiver for transmitting or receiving sidelink transmissionsincluding a first CBR for a first beam that is to be used for receivinga sidelink transmission transmitted by a first sidelink transmitter; andtransmit an indication of the per-beam CBR for each of the one or moreof the beams including the first CBR for the first beam.

In some aspects, a non-transitory computer-readable medium may store oneor more instructions for wireless communication. The one or moreinstructions, when executed by one or more processors of a sidelinkreceiver, may cause the one or more processors to: measure a per-beamCBR for each of one or more beams configured on the sidelink receiverfor transmitting or receiving sidelink transmissions including a firstCBR for a first beam that is to be used for receiving a sidelinktransmission transmitted by a first sidelink transmitter; and transmitan indication of the per-beam CBR for each of the one or more of thebeams including the first CBR for the first beam.

In some aspects, an apparatus for wireless communication may includemeans for measuring a per-beam CBR for each of one or more beamsconfigured on the sidelink receiver for transmitting or receivingsidelink transmissions including a first CBR for a first beam that is tobe used for receiving a sidelink transmission transmitted by a firstsidelink transmitter; and means for transmitting an indication of theper-beam CBR for each of the one or more of the beams including thefirst CBR for the first beam.

In some aspects, a method of wireless communication, performed by asidelink transmitter, may include receiving an indication of a per-beamCBR including a first CBR for a first beam to be used by a sidelinkreceiver for receiving a sidelink transmission transmitted by thesidelink transmitter; and selectively transmitting the sidelinktransmission for reception by sidelink receiver using the first beambased at least in part on the indication of the per-beam CBR.

In some aspects, a sidelink transmitter for wireless communication mayinclude memory and one or more processors operatively coupled to thememory. The memory and the one or more processors may be configured toreceive an indication of a per-beam CBR including a first CBR for afirst beam to be used by a sidelink receiver for receiving a sidelinktransmission transmitted by the sidelink transmitter; and selectivelytransmit the sidelink transmission for reception by sidelink receiverusing the first beam based at least in part on the indication of theper-beam CBR.

In some aspects, a non-transitory computer-readable medium may store oneor more instructions for wireless communication. The one or moreinstructions, when executed by one or more processors of a sidelinktransmitter, may cause the one or more processors to: receive anindication of a per-beam CBR including a first CBR for a first beam tobe used by a sidelink receiver for receiving a sidelink transmissiontransmitted by the sidelink transmitter; and selectively transmit thesidelink transmission for reception by sidelink receiver using the firstbeam based at least in part on the indication of the per-beam CBR.

In some aspects, an apparatus for wireless communication may includemeans for receiving an indication of a per-beam CBR including a firstCBR for a first beam to be used by a sidelink receiver for receiving asidelink transmission transmitted by the apparatus; and means forselectively transmitting the sidelink transmission for reception bysidelink receiver using the first beam based at least in part on theindication of the per-beam CBR.

In some aspects, a method of wireless communication, performed by asidelink receiver, may include receiving a sidelink transmissiontransmitted by a sidelink transmitter; and transmitting a busy signalbased at least in part on receiving the sidelink transmission from thesidelink transmitter, the busy signal indicating that a channelassociated with the sidelink transmission is busy or is occupied, andthe busy signal being transmitted in a time period during which thesidelink receiver is receiving the sidelink transmission from thesidelink transmitter.

In some aspects, a sidelink receiver for wireless communication mayinclude memory and one or more processors operatively coupled to thememory. The memory and the one or more processors may be configured toreceive a sidelink transmission transmitted by a sidelink transmitter;and transmit a busy signal based at least in part on receiving thesidelink transmission from the sidelink transmitter, the busy signalindicating that a channel associated with the sidelink transmission isbusy or is occupied, and the busy signal being transmitted in a timeperiod during which the sidelink receiver is receiving the sidelinktransmission from the sidelink transmitter.

In some aspects, a non-transitory computer-readable medium may store oneor more instructions for wireless communication. The one or moreinstructions, when executed by one or more processors of a sidelinkreceiver, may cause the one or more processors to: receive a sidelinktransmission transmitted by a sidelink transmitter; and transmit a busysignal based at least in part on receiving the sidelink transmissionfrom the sidelink transmitter, wherein the busy signal indicating that achannel associated with the sidelink transmission is busy or isoccupied, and the busy signal being transmitted in a time period duringwhich the sidelink receiver is receiving the sidelink transmission fromthe sidelink transmitter.

In some aspects, an apparatus for wireless communication may includemeans for receiving a sidelink transmission transmitted by a sidelinktransmitter; and means for transmitting a busy signal based at least inpart on receiving the sidelink transmission from the sidelinktransmitter, the busy signal indicating that a channel associated withthe sidelink transmission is busy or is occupied, and the busy signalbeing transmitted in a time period during which the sidelink receiver isreceiving the sidelink transmission from the sidelink transmitter.

In some aspects, a method of wireless communication, performed by asidelink transmitter, may include receiving a busy signal using a beamassociated with a sidelink transmission received by a sidelink receiver,the busy signal indicating that a channel associated with the sidelinktransmission is busy or is occupied, and the busy signal being receivedin a time period during which the sidelink receiver is receiving thesidelink transmission; and selectively transmitting, based at least inpart on the busy signal associated with the sidelink transmission,another sidelink transmission to another sidelink receiver using thebeam.

In some aspects, a sidelink transmitter for wireless communication mayinclude memory and one or more processors operatively coupled to thememory. The memory and the one or more processors may be configured toreceive a busy signal using a beam associated with a sidelinktransmission received by a sidelink receiver, the busy signal indicatingthat a channel associated with the sidelink transmission is busy or isoccupied, and the busy signal being received in a time period duringwhich the sidelink receiver is receiving the sidelink transmission; andselectively transmit, based at least in part on the busy signalassociated with the sidelink transmission, another sidelink transmissionto another sidelink receiver using the beam.

In some aspects, a non-transitory computer-readable medium may store oneor more instructions for wireless communication. The one or moreinstructions, when executed by one or more processors of a sidelinktransmitter, may cause the one or more processors to: receive a busysignal using a beam associated with a sidelink transmission received bya sidelink receiver, the busy signal indicating that a channelassociated with the sidelink transmission is busy or is occupied, andthe busy signal being received in a time period during which thesidelink receiver is receiving the sidelink transmission; andselectively transmit, based at least in part on the busy signalassociated with the sidelink transmission, another sidelink transmissionto another sidelink receiver using the beam.

In some aspects, an apparatus for wireless communication may includemeans for receiving a busy signal using a beam associated with asidelink transmission received by a sidelink receiver, the busy signalindicating that a channel associated with the sidelink transmission isbusy or is occupied, and the busy signal being received in a time periodduring which the sidelink receiver is receiving the sidelinktransmission; and means for selectively transmitting, based at least inpart on the busy signal associated with the sidelink transmission,another sidelink transmission to another sidelink receiver using thebeam.

In some aspects, a method of wireless communication, performed by asidelink device, may include identifying a set of beams associated withcommunicating sidelink transmissions; and determining a set of per-beamchannel busy ratios (CBRs), each CBR corresponding to one of the set ofbeams.

In some aspects, a sidelink device for wireless communication mayinclude memory and one or more processors operatively coupled to thememory. The memory and the one or more processors may be configured toidentify a set of beams associated with communicating sidelinktransmissions; and determine a set of per CBRs, each CBR correspondingto one of the set of beams.

In some aspects, a non-transitory computer-readable medium may store oneor more instructions for wireless communication. The one or moreinstructions, when executed by one or more processors of a sidelinkdevice, may cause the one or more processors to: identify a set of beamsassociated with communicating sidelink transmissions; and determine aset of per-beam CBRs, each CBR corresponding to one of the set of beams.

In some aspects, an apparatus for wireless communication may includemeans for identifying a set of beams associated with communicatingsidelink transmissions; and means for determining a set of per-beamCBRs, each CBR corresponding to one of the set of beams.

Aspects generally include a method, apparatus, system, computer programproduct, non-transitory computer-readable medium, user equipment, basestation, wireless communication device, or processing system assubstantially described with reference to and as illustrated by thedrawings and specification.

The foregoing has outlined rather broadly the features and technicaladvantages of examples in accordance with the disclosure in order thatthe detailed description that follows may be better understood.Additional features and advantages will be described hereinafter. Theconception and specific examples disclosed may be readily utilized as abasis for modifying or designing other structures for carrying out thesame purposes of the present disclosure. Such equivalent constructionsdo not depart from the scope of the appended claims. Characteristics ofthe concepts disclosed herein, both their organization and method ofoperation, together with associated advantages will be better understoodfrom the following description when considered in connection with theaccompanying figures. Each of the figures is provided for the purposesof illustration and description, and not as a definition of the limitsof the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

So that the above-recited features of the present disclosure can beunderstood in detail, a more particular description, briefly summarizedabove, may be had by reference to aspects, some of which are illustratedin the appended drawings. It is to be noted, however, that the appendeddrawings illustrate only some typical aspects of this disclosure and aretherefore not to be considered limiting of its scope, for thedescription may admit to other equally effective aspects. The samereference numbers in different drawings may identify the same or similarelements.

FIG. 1 is a block diagram illustrating an example wireless network inaccordance with various aspects of the present disclosure.

FIG. 2 is a block diagram illustrating an example base station (BS) incommunication with a user equipment (UE) in a wireless network inaccordance with various aspects of the present disclosure.

FIGS. 3-5 are diagrams illustrating examples associated with beamformedchannel busy ratios (CBRs) in accordance with various aspects of thepresent disclosure.

FIGS. 6-10 are diagrams illustrating example processes performed by UEsin accordance with various aspects of the present disclosure.

FIGS. 11-15 are block diagrams of example apparatuses for wirelesscommunication in accordance with various aspects of the presentdisclosure.

DETAILED DESCRIPTION

Various aspects of the disclosure are described more fully hereinafterwith reference to the accompanying drawings. This disclosure may,however, be embodied in many different forms and are not to be construedas limited to any specific structure or function presented throughoutthis disclosure. Rather, these aspects are provided so that thisdisclosure will be thorough and complete, and will fully convey thescope of the disclosure to those skilled in the art. Based on theteachings herein one skilled in the art may appreciate that the scope ofthe disclosure is intended to cover any aspect of the disclosuredisclosed herein, whether implemented independently of or combined withany other aspect of the disclosure. For example, an apparatus may beimplemented or a method may be practiced using any quantity of theaspects set forth herein. In addition, the scope of the disclosure isintended to cover such an apparatus or method which is practiced usingother structure, functionality, or structure and functionality inaddition to or other than the various aspects of the disclosure setforth herein. Any aspect of the disclosure disclosed herein may beembodied by one or more elements of a claim.

Several aspects of telecommunication systems will now be presented withreference to various apparatuses and techniques. These apparatuses andtechniques will be described in the following detailed description andillustrated in the accompanying drawings by various blocks, modules,components, circuits, steps, processes, algorithms, or the like, orcombinations thereof (collectively referred to as “elements”). Theseelements may be implemented using hardware, software, or combinationsthereof. Whether such elements are implemented as hardware or softwaredepends upon the particular application and design constraints imposedon the overall system.

It is noted that while aspects may be described herein using terminologycommonly associated with 3G or 4G wireless technologies, aspects of thepresent disclosure can be applied in other generation-basedcommunication systems, such as 5G and later, including NR technologies.

In a wireless network, a sidelink can be, for example, a communicationlink between a user equipment (UE) and another UE, or a communicationlink between an integrated access backhaul (IAB) node and another IABnode. This differs from an access link, which is a communication linkbetween a UE and a base station or a communication link between an IABnode and a base station. A wireless communication device (for example, aUE, an IAB node) that is to transmit a sidelink transmission is hereinreferred to as a sidelink transmitter, while a wireless communicationdevice that is to receive a sidelink transmission is herein referred toas a sidelink receiver.

Generally, if a channel to be used for a sidelink transmission is busy,then the sidelink transmission may cause interference with or maycollide with another transmission on the channel. Thus, when a sidelinktransmitter needs to transmit a sidelink transmission to a sidelinkreceiver, the sidelink transmitter should take into consideration howbusy the channel is when determining when/whether to transmit thesidelink transmission on the channel. In order to achieve this, thesidelink transmitter may be configured to monitor a channel busy ratio(CBR) associated with the channel. A CBR is a measurement indicative ofhow busy a channel is and, therefore, may indicate a probability ofinterference or of a collision with another transmission on the channel.A relatively high CBR may indicate that the channel is being frequentlyused for transmissions, meaning that a probability of interference orcollision is relatively high. A relatively low CBR may indicate that thechannel is not being used frequently, meaning that a probability ofinterference or collision is relatively low.

In prior wireless communications systems in which CBR-based techniqueshave been implemented, such as a Long Term Evolution (LTE)vehicle-to-anything (V2X) system, a CBR is defined but does not addressthe concept of beamforming. Thus, in a system that uses beamforming (forexample, a New Radio (NR) system that uses millimeter wave (mmW)) theconventional approach to using CBR may be insufficient for assessingchannel use. For example, a first sidelink transmitter that needs totransmit to a first sidelink receiver may attempt to measure a CBRassociated with a channel, but the first sidelink transmitter may not beable to sense a transmission by a second sidelink transmitter (for atransmission to a second sidelink receiver) when a transmit beam used bythe second sidelink transmitter is not aligned with (for example, notoriented in a same direction so as to be overlapping) a receive beam ofthe first sidelink transmitter. In other words, the CBR measurement bythe first sidelink transmitter may not account for the sidelinktransmission from the second sidelink transmitter, meaning that the CBRcannot be reliably used to assess how busy the channel is.

Some aspects described herein provide techniques and apparatuses forbeamformed CBR. In some aspects, a sidelink receiver may measure aper-beam CBR corresponding to a beam to be used for receiving a sidelinktransmission transmitted by a sidelink transmitter, and may transmitindication of the per-beam CBR to the sidelink transmitter. Here, thesidelink transmitter may receive the indication of the per-beam CBR, andmay selectively transmit the sidelink transmission for reception by thesidelink receiver using the beam based at least in part on theindication of the per-beam CBR. In some aspects, a sidelink receiver mayreceive a sidelink transmission transmitted by a sidelink transmitter,and may transmit a busy signal while receiving the sidelink transmissionfrom the sidelink transmitter. Here, another sidelink transmitter mayreceive the busy signal using a beam associated with the sidelinktransmission, and may selectively transmit another sidelink transmissionto another sidelink receiver using the beam based at least in part onthe busy signal. Additional details and examples are described below.

FIG. 1 is a block diagram illustrating an example wireless network 100in accordance with various aspects of the present disclosure. Thewireless network 100 may be a LTE network or some other wirelessnetwork, such as a 5G or NR network. The wireless network 100 mayinclude a quantity of base stations (BSs) 110 (shown as BS 110 a, BS 110b, BS 110 c, and BS 110 d) and other network entities. A BS is an entitythat communicates with user equipment (UE(s)) and may also be referredto as a Node B, an eNodeB, an eNB, a gNB, a NR BS, a 5G node B (NB), anaccess point (AP), a transmit receive point (TRP), or the like, orcombinations thereof (these terms are used interchangeably herein). EachBS may provide communication coverage for a particular geographic area.In 3GPP, the term “cell” can refer to a coverage area of a BS or a BSsubsystem serving this coverage area, depending on the context in whichthe term is used.

A BS may provide communication coverage for a macro cell, a pico cell, afemto cell, or another type of cell. A macro cell may cover a relativelylarge geographic area (for example, several kilometers in radius) andmay allow unrestricted access by UEs with service subscription. A picocell may cover a relatively small geographic area and may allowunrestricted access by UEs with service subscription. A femto cell maycover a relatively small geographic area (for example, a home) and mayallow restricted access by UEs having association with the femto cell(for example, UEs in a closed subscriber group (CSG)). ABS for a macrocell may be referred to as a macro BS. A BS for a pico cell may bereferred to as a pico BS. A BS for a femto cell may be referred to as afemto BS or a home BS. A BS may support one or multiple (for example,three) cells.

Wireless network 100 may be a heterogeneous network that includes BSs ofdifferent types, for example, macro BSs, pico BSs, femto BSs, relay BSs,or the like, or combinations thereof. These different types of BSs mayhave different transmit power levels, different coverage areas, anddifferent impacts on interference in wireless network 100. For example,macro BSs may have a high transmit power level (for example, 5 to 40Watts) whereas pico BSs, femto BSs, and relay BSs may have lowertransmit power levels (for example, 0.1 to 2 Watts). In the exampleshown in FIG. 1 , a BS 110 a may be a macro BS for a macro cell 102 a, aBS 110 b may be a pico BS for a pico cell 102 b, and a BS 110 c may be afemto BS for a femto cell 102 c. A network controller 130 may couple tothe set of BSs 102 a, 102 b, 110 a and 110 b, and may providecoordination and control for these BSs. Network controller 130 maycommunicate with the BSs via a backhaul. The BSs may also communicatewith one another, for example, directly or indirectly via a wireless orwireline backhaul.

In some aspects, a cell may not be stationary, rather, the geographicarea of the cell may move in accordance with the location of a mobileBS. In some aspects, the BSs may be interconnected to one another or toone or more other BSs or network nodes (not shown) in the wirelessnetwork 100 through various types of backhaul interfaces such as adirect physical connection, a virtual network, or the like, orcombinations thereof using any suitable transport network.

Wireless network 100 may also include relay stations. A relay station isan entity that can receive a transmission of data from an upstreamstation (for example, a BS or a UE) and send a transmission of the datato a downstream station (for example, a UE or a BS). A relay station mayalso be a UE that can relay transmissions for other UEs. In the exampleshown in FIG. 1 , a relay station 110 d may communicate with macro BS110 a and a UE 120 d in order to facilitate communication between BS 110a and UE 120 d. A relay station may also be referred to as a relay BS, arelay base station, a relay, or the like, or combinations thereof.

UEs 120 (for example, 120 a, 120 b, 120 c) may be dispersed throughoutwireless network 100, and each UE may be stationary or mobile. A UE mayalso be referred to as an access terminal, a terminal, a mobile station,a subscriber unit, a station, or the like, or combinations thereof. A UEmay be a cellular phone (for example, a smart phone), a personal digitalassistant (PDA), a wireless modem, a wireless communication device, ahandheld device, a laptop computer, a cordless phone, a wireless localloop (WLL) station, a tablet, a camera, a gaming device, a netbook, asmartbook, an ultrabook, a medical device or equipment, biometricsensors/devices, wearable devices (smart watches, smart clothing, smartglasses, smart wrist bands, smart jewelry (for example, smart ring,smart bracelet)), an entertainment device (for example, a music or videodevice, or a satellite radio), a vehicular component or sensor, smartmeters/sensors, industrial manufacturing equipment, a global positioningsystem device, or any other suitable device that is configured tocommunicate via a wireless medium.

Some UEs may be considered machine-type communication (MTC) or evolvedor enhanced machine-type communication (eMTC) UEs. MTC and eMTC UEsinclude, for example, robots, drones, remote devices, sensors, meters,monitors, location tags, or the like, or combinations thereof, that maycommunicate with a base station, another device (for example, remotedevice), or some other entity. A wireless node may provide, for example,connectivity for or to a network (for example, a wide area network suchas Internet or a cellular network) via a wired or wireless communicationlink. Some UEs may be considered Internet-of-Things (IoT) devices, ormay be implemented as NB-IoT (narrowband internet of things) devices.Some UEs may be considered a Customer Premises Equipment (CPE). UE 120may be included inside a housing that houses components of UE 120, suchas processor components, memory components, or the like, or combinationsthereof.

In general, any quantity of wireless networks may be deployed in a givengeographic area. Each wireless network may support a particular radioaccess technology (RAT) and may operate on one or more frequencies orfrequency channels. A frequency may also be referred to as a carrier orthe like, or combinations thereof. Each frequency may support a singleRAT in a given geographic area in order to avoid interference betweenwireless networks of different RATs. In some cases, NR or 5G RATnetworks may be deployed.

In some aspects, two or more UEs 120 (for example, shown as UE 120 a andUE 120 e) may communicate directly with one another using one or moresidelink channels (for example, without using a base station 110 as anintermediary). For example, the UEs 120 may communicate usingpeer-to-peer (P2P) communications, device-to-device (D2D)communications, a vehicle-to-everything (V2X) protocol (for example,which may include a vehicle-to-vehicle (V2V) protocol, avehicle-to-infrastructure (V2I) protocol, or the like, or combinationsthereof), a mesh network, or the like, or combinations thereof. In thiscase, the UE 120 may perform scheduling operations, resource selectionoperations, or other operations described elsewhere herein as beingperformed by the base station 110.

FIG. 2 is a block diagram 200 illustrating an example base station (BS)in communication with a user equipment (UE) in a wireless network inaccordance with various aspects of the present disclosure. Base station110 may be equipped with T antennas 234 a through 234 t, and UE 120 maybe equipped with R antennas 252 a through 252 r, where in general T≥1and R≥1.

At base station 110, a transmit processor 220 may receive data from adata source 212 for one or more UEs, select one or more modulation andcoding schemes (MCSs) for each UE based at least in part on channelquality indicators (CQIs) received from the UE, process (for example,encode) the data for each UE based at least in part on the MCS(s)selected for the UE, and provide data symbols for all UEs. Transmitprocessor 220 may also process system information (for example, forsemi-static resource partitioning information (SRPI) or the like, orcombinations thereof) and control information (for example, CQIrequests, grants, upper layer signaling, or the like, or combinationsthereof) and provide overhead symbols and control symbols. Transmitprocessor 220 may also generate reference symbols for reference signals(for example, the cell-specific reference signal (CRS)) andsynchronization signals (for example, the primary synchronization signal(PSS) and secondary synchronization signal (SSS)). A transmit (TX)multiple-input multiple-output (MIMO) processor 230 may perform spatialprocessing (for example, precoding) on the data symbols, the controlsymbols, the overhead symbols, or the reference symbols, if applicable,and may provide T output symbol streams to T modulators (MODs) 232 athrough 232 t. Each MOD 232 may process a respective output symbolstream (for example, for OFDM or the like, or combinations thereof) toobtain an output sample stream. Each MOD 232 may further process (forexample, convert to analog, amplify, filter, and upconvert) the outputsample stream to obtain a downlink signal. T downlink signals from MODs232 a through 232 t may be transmitted via T antennas 234 a through 234t, respectively. In accordance with various aspects described in moredetail below, the synchronization signals can be generated with locationencoding to convey additional information.

At UE 120, antennas 252 a through 252 r may receive the downlink signalsfrom base station 110 or other base stations and may provide receivedsignals to R demodulators (DEMODs) 254 a through 254 r, respectively.Each DEMOD 254 may condition (for example, filter, amplify, downconvert,and digitize) a received signal to obtain input samples. Each DEMOD 254may further process the input samples (for example, for OFDM or thelike, or combinations thereof) to obtain received symbols. A MIMOdetector 256 may obtain received symbols from all R DEMODs 254 a through254 r, perform MIMO detection on the received symbols if applicable, andprovide detected symbols. A receive processor 258 may process (forexample, decode) the detected symbols, provide decoded data for UE 120to a data sink 260, and provide decoded control information and systeminformation to a controller/processor 280. A channel processor maydetermine a reference signal received power (RSRP), a received signalstrength indicator (RSSI), a reference signal received quality (RSRQ), achannel quality indicator (CQI), or the like, or combinations thereof.In some aspects, one or more components of UE 120 may be included in ahousing.

On the uplink, at UE 120, a transmit processor 264 may receive andprocess data from a data source 262 as well as control information (forexample, for reports including RSRP, RSSI, RSRQ, CQI, or the like, orcombinations thereof) from controller/processor 280. Transmit processor264 may also generate reference symbols for one or more referencesignals. The symbols from transmit processor 264 may be precoded by a TXMIMO processor 266 if applicable, further processed by MODs 254 athrough 254 r (for example, for discrete Fourier transform spreadorthogonal frequency division multiplexing (DFT-s-OFDM), orthogonalfrequency division multiplexing (OFDM) with a cyclic prefix (CP)(CP-OFDM), or the like, or combinations thereof), and transmitted tobase station 110. At base station 110, the uplink signals from UE 120and other UEs may be received by antennas 234, processed by DEMODs 232,detected by a MIMO detector 236 if applicable, and further processed bya receive processor 238 to obtain decoded data and control informationsent by UE 120. Receive processor 238 may provide the decoded data to adata sink 239 and the decoded control information tocontroller/processor 240. Base station 110 may include communicationunit 244 and communicate to network controller 130 via communicationunit 244. Network controller 130 may include communication unit 294,controller/processor 290, and memory 292.

Controller/processor 240 of base station 110, controller/processor 280of UE 120, or any other component(s) of FIG. 2 may perform one or moretechniques associated with beamformed CBR, as described in more detailelsewhere herein. For example, controller/processor 240 of base station110, controller/processor 280 of UE 120, or any other component(s) ofFIG. 2 may perform or direct operations of, for example, process 600 ofFIG. 6 , process 700 of FIG. 7 , process 800 of FIG. 8 , or otherprocesses as described herein. Memories 242 and 282 may store data andprogram codes for base station 110 and UE 120, respectively. A scheduler246 may schedule UEs for data transmission on the downlink or uplink.

In some aspects, UE 120 may include means for measuring a per-beam CBRfor each of one or more beams configured on the sidelink receiver fortransmitting or receiving sidelink transmissions including a first CBRfor a first beam that is to be used for receiving a sidelinktransmission transmitted by a first sidelink transmitter; means fortransmitting an indication of the per-beam CBR for each of the one ormore of the beams including the first CBR for the first beam; or thelike, or combinations thereof. In some aspects, such means may includeone or more components of UE 120 described in connection with FIG. 2 .

In some aspects, UE 120 may include means for receiving an indication ofa per-beam CBR including a first CBR for a first beam to be used by asidelink receiver for receiving a sidelink transmission transmitted bythe sidelink transmitter; means for selectively transmitting thesidelink transmission to the sidelink receiver by the sidelinktransmitter using the first beam based at least in part on theindication of the per-beam CBR; or the like, or combinations thereof. Insome aspects, such means may include one or more components of UE 120described in connection with FIG. 2 .

In some aspects, UE 120 may include means for receiving a sidelinktransmission transmitted by a sidelink transmitter; means fortransmitting a busy signal based at least in part on receiving thesidelink transmission from the sidelink transmitter, the busy signalindicating that a channel associated with the sidelink transmission isbusy or is occupied, and the busy signal being transmitted in a timeperiod during which the sidelink receiver is receiving the sidelinktransmission from the sidelink transmitter; or the like, or combinationsthereof. In some aspects, such means may include one or more componentsof UE 120 described in connection with FIG. 2 .

In some aspects, UE 120 may include means for receiving a busy signalusing a beam associated with a sidelink transmission received by asidelink receiver, the busy signal indicating that a channel associatedwith the sidelink transmission is busy or is occupied, and the busysignal being received in a time period during which the sidelinkreceiver is receiving the sidelink transmission; means for selectivelytransmitting, based at least in part on the busy signal associated withthe sidelink transmission, another sidelink transmission to anothersidelink receiver using the beam; or the like, or combinations thereof.In some aspects, such means may include one or more components of UE 120described in connection with FIG. 2 .

In some aspects, UE 120 may include means for identifying a set of beamsassociated with communicating sidelink transmissions; means fordetermining a set of per-beam CBRs, each CBR corresponding to one of theset of beams; or the like, or combinations thereof. In some aspects,such means may include one or more components of UE 120 described inconnection with FIG. 2 .

In a wireless network, a sidelink can be, for example, a communicationlink between a UE and another UE, or a communication link between an IABnode and another IAB node. This differs from an access link, which is acommunication link between a UE and a base station or a communicationlink between an IAB node and a base station. A wireless communicationdevice (for example, a UE, an IAB node) that is to transmit a sidelinktransmission is herein referred to as a sidelink transmitter, while awireless communication device that is to receive a sidelink transmissionis herein referred to as a sidelink receiver.

Generally, if a channel to be used for a sidelink transmission is busy,then the sidelink transmission may cause interference with or maycollide with another transmission on the channel. Thus, when a sidelinktransmitter needs to transmit a sidelink transmission to a sidelinkreceiver, the sidelink transmitter should take into consideration howbusy the channel is when determining when/whether to transmit thesidelink transmission on the channel. In order to achieve this, thesidelink transmitter may be configured to monitor a CBR associated withthe channel. A CBR is a measurement indicative of how busy a channel isand, therefore, may indicate a probability of interference or acollision with another transmission on the channel. A relatively highCBR may indicate that the channel is being frequently used fortransmissions, meaning that a probability of interference or a collisionis relatively high. A relatively low CBR may indicate that the channelis not being used frequently, meaning that a probability of interferenceor a collision is relatively low.

In prior wireless communications systems in which CBR-based techniqueshave been implemented, such as an LTE V2X system, a CBR is defined butdoes not address the concept of beamforming. Thus, in a system that usesbeamforming (for example, an NR system that uses mmW) the conventionalapproach to CBR may be insufficient for assessing channel use. Forexample, a first sidelink transmitter that needs to transmit to a firstsidelink receiver may attempt to measure a CBR associated with achannel, but the first sidelink transmitter may not be able to sense atransmission by a second sidelink transmitter (for a transmission to asecond sidelink receiver) when a transmit beam used by the secondsidelink transmitter is not aligned with a receive beam of the firstsidelink transmitter. In other words, the CBR measurement by the firstsidelink transmitter may not account for the sidelink transmission fromthe second sidelink transmitter, meaning that the CBR cannot be reliablyused to assess how busy the channel is.

Some aspects described herein provide techniques and apparatuses forbeamformed CBR. In some aspects, a sidelink receiver may measure aper-beam CBR corresponding to a beam to be used for receiving a sidelinktransmission transmitted by a sidelink transmitter, and may transmitindication of the per-beam CBR to the sidelink transmitter. Here, thesidelink transmitter may receive the indication of the per-beam CBR, andmay selectively transmit the sidelink transmission for reception by thesidelink receiver using the beam based at least in part on theindication of the per-beam CBR. In some aspects, a sidelink receiver mayreceive a sidelink transmission transmitted by a sidelink transmitter,and may transmit a busy signal while receiving the sidelink transmissionfrom the sidelink transmitter. Here, another sidelink transmitter mayreceive the busy signal using a beam associated with the sidelinktransmission, and may selectively transmit another sidelink transmissionto another sidelink receiver using the beam based at least in part onthe busy signal. Additional details and examples are described below.

FIGS. 3-5 are diagrams illustrating examples associated with beamformedCBR in accordance with various aspects of the present disclosure.

FIG. 3 illustrates an example aspect 300 for beamformed CBR that can beused when, for example, the sidelink transmitter and sidelink receiverare out of coverage (in other words, not connected to a base station 110via respective access links).

As shown in FIG. 3 , in a first operation 305, sidelink transmitter UE3(for example, a UE 120) transmits a sidelink transmission to sidelinkreceiver UE1 (for example, a UE 120). As shown, sidelink transmitter UE3transmits the sidelink transmission using a beamformed beam B2, andsidelink receiver UE1 receives the sidelink transmitter using abeamformed beam B3. In this example, sidelink transmitter UE4 (forexample, a UE 120) needs to transmit a sidelink transmission to sidelinkreceiver UE2 (for example, a UE 120). Notably, if sidelink transmitterUE4 were to attempt to measure a CBR associated with the channel using abeamformed receive beam, sidelink transmitter UE4 would not be able tosense the transmission by sidelink transmitter UE3 because beam B2 wouldnot be aligned with the receive beam of sidelink transmitter UE4.

As further shown in FIG. 3 , in a second operation 310, sidelinkreceiver UE2 may measure a per-beam CBR corresponding to a beam to beused for receiving a sidelink transmission transmitted by the sidelinktransmitter UE4 (for example, beamformed beam B4). A per-beam CBR is aCBR specific to beam to be used for receiving a sidelink transmission.In this example, the per-beam CBR is a CBR specific to the receive beam(beam B4) for receiving the sidelink transmission from sidelinktransmitter UE4. In some aspects, the per-beam CBR includes one or moreCBRs associated with or more beams configured on the sidelink receiverUE2 for transmitting or receiving sidelink transmissions. Here, theper-beam CBR includes a CBR for a beam to be used for receiving asidelink transmission transmitted by the sidelink transmitter UE4.

In some aspects, a sidelink device (for example, a sidelink receiver ora sidelink transmitter) may be configured with a set of n (n≥1) beamsassociated with communicating (in other words, transmitting orreceiving) sidelink transmissions. In some aspects, when measuring aper-beam CBR, the sidelink device may measure how busy a channel is foreach of the set of n configured beams during a particular set of timeslots (for example, time slots t−100 to t−1). When performing thesemeasurements, the sidelink device may, in each of the set of time slots,receive or sense any signal using each of the set of n beams. Generally,if a measurement (for example, a reference signal received power (RSRP))associated with a given beam satisfies a configured threshold, then thesidelink device may determine that the channel is busy on that beam. Asindicated, in some aspects, the sidelink device may determine a per-beamCBR for one or more of the set of n beams. For example, the sidelinkdevice may identify the set of n beams associated with communicatingsidelink transmissions, and may determine a set of n per-beam CBRs, eachCBR corresponding to one of the set of n beams. In the example shown inFIG. 3 , beam B4 is one of the n beams configured on sidelink receiverUE2. Therefore, sidelink receiver UE2 may measure the per-beam CBRcorresponding to beam B4.

As further shown in FIG. 3 , in a third operation 315, sidelink receiverUE2 may transmit information associated with the per-beam CBR. In someaspects, sidelink receiver UE2 may transmit the information associatedwith the per-beam CBR (directly) to sidelink transmitter UE4 (in otherwords, the sidelink transmitter from which the sidelink transmission isto be received). The information associated with the per-beam CBR maybe, for example, an indication of the per-beam CBR, feedback informationbased on the per-beam CBR, or another item of information that providesinformation indicative of a result of the measurement of the per-beamCBR. In some aspects, the per-beam CBR may include a CBR for each of oneor more of the beams, including the CBR for the beam. In some aspects,the sidelink receiver UE2 may transmit the information associated withthe per-beam CBR (such as the indication of the per-beam CBR) to a setof sidelink transmitters including the sidelink transmitter UE4. Thatis, in some aspects, the sidelink receiver UE2 may transmit the per-beamCBR to multiple sidelink transmitters. In some aspects, the sidelinkreceiver UE2 may transmit a set of UE identifiers corresponding to theset of sidelink transmitters that are to receive the indication of theper-beam CBR. In some aspects, the sidelink receiver UE2 may transmit aUE identifier of the sidelink receiver UE2 or and a beam identifier ofthe per-beam CBR with the indication of the per-beam CBR.

In some aspects, sidelink receiver UE2 may transmit the informationassociated with the per-beam CBR using beam B4 (in other words, the beamassociated with the CBR). In some aspects, sidelink receiver UE2 may beconfigured to measure and/or transmit the per-beam CBR (automatically)on a periodic basis.

In some aspects, a of measurement of the per-beam CBR or a transmissionof the indication of the per-beam CBR may depend on the beam. That is,in some aspects, the periodicity of the measurement of the per-beam CBRor the transmission of the indication of the per-beam CBR may bedifferent depending on the beam.

In some aspects, sidelink receiver UE2 may transmit the informationassociated with the per-beam CBR in a set of time-frequency resourcesthat corresponds to beam B4. Here, both sidelink receiver UE2 andsidelink transmitter UE4 may be configured with information associatingthe set of time-frequency resources with beam B4. Therefore, uponreceiving the per-beam CBR in the set of time-frequency resources,sidelink transmitter UE4 may determine that the received per-beam CBRcorresponds to beam B4. In some aspects, sidelink receiver UE1, sidelinkreceiver UE2, sidelink transmitter UE3, and sidelink transmitter UE4 mayhave common timing (for example, determined from, for example, a globalpositioning system (GPS) signal).

As further shown in FIG. 3 , in a fourth operation 320, sidelinktransmitter UE4 may receive the information associated with the per-beamCBR associated with beam B4, and may selectively transmit the sidelinktransmission for reception by sidelink receiver UE2 using beam B4. Insome aspects, as shown in FIG. 3 , sidelink transmitter UE4 may receivethe information associated with the per-beam CBR (directly) fromsidelink receiver UE2 (for example, since both sidelink transmitter UE4and sidelink receiver UE2 are out of coverage). In some aspects,sidelink transmitter UE4 may receive the information associated with theper-beam CBR on a periodic basis and/or in a set of time-frequencyresources that corresponds to beam B4, as described above.

In some aspects, sidelink transmitter UE4 may selectively transmit thesidelink transmission based at least in part on the informationassociated with the per-beam CBR. For example, sidelink transmitter UE4may use the per-beam CBR and information associated with a priority ofthe sidelink transmission (for example, proximity service (ProSe) perpacket priority) to determine whether to transmit the sidelinktransmission in a next sidelink slot, and may proceed accordingly.

In some aspects, the per-beam CBR may include a plurality of CBRs forthe beam, each associated with a different threshold. That is, in someaspects, the beam may be associated with multiple thresholds. Thus, fora given CBR associated with the beam, an associated threshold may low.This may cause a measurement indicating a lower power received signal asindicating busyness. A lower power threshold may be useful, for example,in the case of a wide beam (since a wide beam is not able to receive asignal with a high RSRP because the wide beam has a lower beam forminggain than a narrow beam). Thus, the CBR associated with the lowthreshold may be used or a wide beam. Conversely, a CBR associated withhigh threshold may be used for a narrow beam. In some aspects, each beamconfigured on the sidelink receiver UE2 may be associated with adifferent threshold (depending on a footprint of the beam).

In some aspects, when there are multiple CBRs associated with the beam,the transmitted indication of the per-beam CBR may include an indicationof each of the multiple CBRs, or alternatively may include an indicationof a subset of the multiple CBRs. In some aspects, the subset of CBRsmay be selected from the multiple CBRs based at least in part on, forexample, an instruction received from a base station, a priority of thesidelink transmission, or a priority of the sidelink transmitter UE4.Thus, in some aspects when there are multiple CBRs with differentthresholds, the sidelink receiver UE2 may transmit all of the CBRS oronly a selected few. As an example, if the sidelink transmitter UE4 is ahigh priority sidelink transmitter, then the sidelink transmitter UE4may use a higher threshold CBR to decide whether to transmit thesidelink transmission (since the higher threshold is less likely toindicate the channel is busy). In such, a case, the indication of theper-beam CBR transmitted by the sidelink receiver UE2 may includeinformation associated with the CBR associated with the higherthreshold.

In some aspects, the per-beam CBR may include a plurality of CBRs, eachfo which are associated with a different beam, and each beam may beassociated with a different threshold.

FIG. 4 illustrates an example aspect 400 for beamformed CBR that can beused when, for example, the sidelink transmitter and sidelink receiverare in coverage (in other words, connected to a base station 110 viarespective access links).

As shown in FIG. 4 , in a first operation 405, sidelink transmitter UE3(for example, a UE 120) transmits a sidelink transmission to sidelinkreceiver UE1 (for example, a UE 120). As shown, sidelink transmitter UE3transmits the sidelink transmission using a beamformed beam B2, andsidelink receiver UE1 receives the sidelink transmitter using abeamformed beam B3. In this example, sidelink transmitter UE4 (forexample, a UE 120) needs to transmit a sidelink transmission to sidelinkreceiver UE2 (for example, a UE 120), similar to the example describedabove in association with FIG. 3 .

As further shown in FIG. 4 , in a second operation 410, sidelinkreceiver UE2 may measure a per-beam CBR corresponding to a beam to beused for receiving a sidelink transmission transmitted by the sidelinktransmitter UE4 (for example, beamformed beam B4). In some aspects,sidelink receiver UE2 may measure the per-beam CBR in the mannerdescribed above in association with FIG. 3 .

As further shown in FIG. 4 , in a third operation 415, sidelink receiverUE2 may transmit information associated with the per-beam CBR. In someaspects, sidelink receiver UE2 may transmit the information associatedwith the per-beam CBR to a base station (for example, base station 110)configured to relay the information associated with the per-beam CBR tosidelink transmitter UE4. In other words, in some aspects, sidelinkreceiver UE2 may transmit the information associated with the per-beamCBR to the base station via a first access link such that the basestation can forward the information associated with the per-beam CBR tosidelink transmitter UE4 via a second access link.

In some aspects, sidelink receiver UE2 may measure and transmit theper-beam CBR based at least in part on an indication from the basestation that sidelink receiver UE2 is to receive the sidelinktransmission from sidelink transmitter UE4. For example, sidelinktransmitter UE4 may provide an indication to the base station thatsidelink transmitter UE4 needs to transmit the sidelink transmission tosidelink receiver UE2. Here, the base station may receive theindication, and may provide to sidelink receiver UE2 an indication thatthe sidelink receiver UE2 is to receive the sidelink transmission fromsidelink transmitter UE4. In this example, sidelink receiver UE2 maymeasure and transmit the per-beam CBR based at least in part on theindication from the base station. In some aspects, the indication mayidentify the beam for which the per-beam CBR is to be measured, andsidelink receiver UE2 may measure and transmit the per-beam CBR,accordingly.

As further shown in FIG. 4 , in a fourth operation 420, sidelinktransmitter UE4 may receive the information associated with the per-beamCBR associated with beam B4, and may selectively transmit the sidelinktransmission for reception by sidelink receiver UE2 using beam B4. Insome aspects, as shown in FIG. 4 , sidelink transmitter UE4 may receivethe information associated with the per-beam CBR from the base stationconfigured to relay the information associated with the per-beam CBRfrom sidelink receiver UE2. In some aspects, sidelink transmitter UE4may selectively transmit the sidelink transmission in the mannerdescribed in association with FIG. 3 .

FIG. 5 illustrates an example aspect 500 for beamformed CBR thatutilizes a busy signal transmitted by a sidelink receiver whilereceiving a sidelink transmitter.

As shown in FIG. 5 , in a first operation 505, sidelink transmitter UE3(for example, a UE 120) transmits a sidelink transmission to sidelinkreceiver UE1 (for example, a UE 120). As shown, sidelink transmitter UE3transmits the sidelink transmission using a beamformed beam B2, andsidelink receiver UE1 receives the sidelink transmitter using abeamformed beam B3. In this example, sidelink transmitter UE4 (forexample, a UE 120) needs to transmit a sidelink transmission to sidelinkreceiver UE2 (for example, a UE 120), similar to the example describedabove in association with FIG. 3 .

As further shown in FIG. 5 , in a second operation 510, sidelinkreceiver UE1 may transmit a busy signal while receiving the sidelinktransmission from sidelink transmitter UE3. The busy signal is a signalindicating that a channel associated with a sidelink transmission isbusy or occupied. In some aspects, sidelink receiver UE1 may transmitthe busy signal in a time period during which sidelink receiver UE1 isreceiving the sidelink transmission from sidelink transmitter UE3. Insome aspects, as described in further detail below, if another sidelinkdevice (for example, sidelink transmitter UE4) receives the busy signalon a given beam, then the sidelink device may determine that the channelon that beam is busy or occupied with another sidelink transmitter.

In some aspects, a frequency of the busy signal may indicate a frequencyband associated with the sidelink transmission. For example, a busysignal on a particular frequency may indicate that a current sidelinktransmission is being received on a particular physical resource block(PRB). In this way, the busy signal may convey information thatidentifies which frequency band is being used for the sidelinktransmission. In some aspects, a codeword or a sequence transmitted inthe busy signal may indicate occupancy of a set of resources of afrequency band associated with the sidelink transmission. For example, afirst codeword (for example, 101010) may be used to indicate occupancyof a first PRB, while a second codeword (for example, 010101) may beused to indicate occupancy of a second PRB. In general, both how busy(for example, a fraction of resource blocks (RBs) used) and a frequencyband over which busy-ness of a channel is measured (for example, a rangeof RBs) can be indicated by some combination of a tone-index on whichthe busy signal is transmitted and a codeword or a sequence transmittedon the busy signal.

In some aspects, a frequency band of the busy signal may not overlapwith a frequency band associated with the sidelink transmission.Alternatively, a frequency band of the busy signal may overlap with thefrequency band associated with the sidelink transmission. In someaspects, the busy signal may be frequency division multiplexed with afrequency band associated with the sidelink transmission (to assist withinterference management).

In some aspects, a beam or a panel on which the busy signal istransmitted may be different from a beam or a panel on which thesidelink transmission is being received. In some aspects, the busysignal is transmitted on multiple beams or on multiple panels.

In some aspects, a beam on which the busy signal is transmitted may havea different characteristic than the beam on which the sidelinktransmission is received. For example, the beam on which the busy signalis transmitted may be wider than a receive beam on which the sidelinktransmission is being received.

In some aspects, the busy signal may indicate a receive beam used toreceive the sidelink transmission, and the receive beam may beidentified with respect to a sidelink synchronization beam. For example,a busy signal transmitted on a first frequency may indicate thatsidelink receiver UE1 is using a receive beam that is quasi-co-located(QCL) with a first synchronization beam, while a busy signal transmittedon a second frequency may indicate that sidelink receiver UE1 is using areceive beam that is QCL with a second synchronization beam.

In some aspects, the busy signal may indicate a direction of a receivebeam used to receive the sidelink transmission. For example, a busysignal transmitted on a first frequency may indicate that sidelinkreceiver UE1 is using a receive beam that is oriented at 0 degreesnorth, while a busy signal transmitted on a second frequency mayindicate that sidelink receiver UE1 is using a receive beam that isoriented at 10 degrees north-northeast.

In some aspects, the busy signal may indicate an identify of thesidelink receiver. For example, the busy signal a busy signaltransmitted on a first frequency may indicate a UE identifier forsidelink receiver UE1.

As further shown in FIG. 5 , in a third operation 515, sidelinktransmitter UE4 may receive the busy signal using a beam associated withthe sidelink transmission being received by sidelink receiver UE1, andmay selectively transmit, based at least in part on the busy signal, thesidelink transmission to sidelink receiver UE2 using the beam. In someaspects, sidelink transmitter UE4 may receive the busy signal on thebeam to be used for transmitting the sidelink transmission to UE2. Insome aspects, as shown in FIG. 5 , sidelink transmitter UE4 may receivethe busy signal (directly) from sidelink receiver UE1. In some aspects,the sidelink transmitter may compute a per-beam CBR for a receive beamto be used by the sidelink receiver UE2 for receiving the sidelinktransmission based at least in part on the busy signal, and mayselectively transmit the sidelink transmission based at least in part onthe computed per-beam CBR.

In some aspects, sidelink transmitter UE4 may selectively transmit thesidelink transmission based at least in part on the busy signal. Forexample, sidelink transmitter UE4 may determine information associatedwith the busy signal (for example, the frequency band associated withthe UE3-UE1 sidelink transmission, information that identifies thereceive beam used by sidelink receiver UE1 to receive the UE3-UE1sidelink transmission, or the like) to determine whether to transmit thesidelink transmission in a next sidelink slot, and may proceedaccordingly.

FIG. 6 is a diagram illustrating an example process 600 performed, forexample, by a sidelink receiver, in accordance with various aspects ofthe present disclosure. Example process 600 is an example where asidelink receiver (for example, UE 120) performs operations associatedwith beamformed CBR.

As shown in FIG. 6 , in some aspects, process 600 may include measuringa per-beam CBR for each of one or more beams configured on the sidelinkreceiver for transmitting or receiving sidelink transmissions includinga first CBR for a first beam that is to be used for receiving a sidelinktransmission transmitted by a first sidelink transmitter (for example,using receive processor 258, controller/processor 280, memory 282) maymeasure a per-beam CBR for each of one or more beams configured on thesidelink receiver for transmitting or receiving sidelink transmissionsincluding a first CBR for a first beam that is to be used for receivinga sidelink transmission transmitted by a first sidelink transmitter, asdescribed above. In some aspects, the per-beam CBR is a CBR that isspecific to the first beam to be used for receiving the sidelinktransmission. In some aspects, the first beam is one of a set of beams,associated with communicating sidelink transmissions, that is configuredon the sidelink receiver.

As further shown in FIG. 6 , in some aspects, process 600 may includetransmitting an indication of the per-beam CBR for each of the one ormore of the beams including the first CBR for the first beam (block620). For example, the sidelink receiver (for example, using transmitprocessor 264, controller/processor 280, memory 282) may transmit anindication of the per-beam CBR for each of the one or more of the beamsincluding the first CBR for the first beam, as described above.

Process 600 may include additional aspects, such as any single aspect orany combination of aspects described below and/or in connection with oneor more other processes described elsewhere herein.

In a first aspect, the indication of the per-beam CBR is transmittedusing the first beam.

In a second additional aspect, alone or in combination with the firstaspect, the indication of the per-beam CBR is transmitted to a set ofsidelink transmitters including the first sidelink transmitter, or istransmitted to a base station configured to relay the indication of theper-beam CBR to the set of sidelink transmitters.

In a third additional aspect, alone or in combination with one or moreof the first and second aspects, process 500 includes transmitting a setof UE identifiers corresponding to the set of sidelink transmitters.

In a fourth additional aspect, alone or in combination with one or moreof the first through third aspects, process 500 includes transmitting aUE identifier of the sidelink receiver and a beam identifier of theper-beam CBR.

In a fifth additional aspect, alone or in combination with one or moreof the first through fourth aspects, the sidelink receiver is configuredto periodically measure and transmit the indication of the per-beam CBR,wherein a periodicity of the measurement of the per-beam CBR or thetransmission of the indication of the per-beam CBR depends on the firstbeam.

In a sixth additional aspect, alone or in combination with one or moreof the first through fifth aspects, transmitting the indication of theper-beam CBR comprises: determining information identifying a particularset of time-frequency resources that corresponds to the first beam, andtransmitting the indication of the per-beam CBR in the particular set oftime-frequency resources.

In a seventh additional aspect, alone or in combination with one or moreof the first through sixth aspects, the sidelink receiver and the firstsidelink transmitter have common timing.

In an eighth additional aspect, alone or in combination with one or moreof the first through seventh aspects, the sidelink receiver measures andtransmits the per-beam CBR based at least in part on an indication froma base station that the sidelink receiver is to receive the sidelinktransmission.

In a ninth additional aspect, alone or in combination with one or moreof the first through eighth aspects, the per-beam CBR includes aplurality of CBRs for the first beam, each associated with a differentthreshold.

In a tenth additional aspect, alone or in combination with one or moreof the first through ninth aspects, the transmitted indication of theper-beam CBR includes an indication of each CBR of the plurality ofCBRs.

In an eleventh additional aspect, alone or in combination with one ormore of the first through tenth aspects, the transmitted indication ofthe per-beam CBR includes an indication of a subset of CBRs that isselected from the plurality of CBRs.

In a twelfth additional aspect, alone or in combination with one or moreof the first through eleventh aspects, the subset of CBRs is selectedbased at least in part on at least one of: an instruction received froma base station, a priority of the sidelink transmission, or a priorityof the sidelink transmitter.

In a thirteenth additional aspect, alone or in combination with one ormore of the first through twelfth aspects, the first CBR is associatedwith a threshold selected for assessing busyness for a wide beam.

In a fourteenth additional aspect, alone or in combination with one ormore of the first through thirteenth aspects, the first CBR isassociated with a threshold selected for assessing busyness for a narrowbeam.

In a fifteenth additional aspect, alone or in combination with one ormore of the first through fourteenth aspects, the per-beam CBR includesa second CBR for a second beam of the one or more beams, wherein thefirst CBR is associated with a first threshold and the second CBR isassociated with a second threshold that is different from the firstthreshold.

FIG. 7 is a diagram illustrating an example process 700 performed, forexample, by a sidelink transmitter, in accordance with various aspectsof the present disclosure. Example process 700 is an example where asidelink transmitter (for example, UE 120) performs operationsassociated with beamformed CBR.

As shown in FIG. 7 , in some aspects, process 700 may include receivingan indication of a per-beam CBR including a first CBR for a first beamto be used by a sidelink receiver for receiving a sidelink transmissiontransmitted by the sidelink transmitter (block 710). For example, thesidelink transmitter (for example, using receive processor 258,controller/processor 280, memory 282) may receive an indication of aper-beam CBR including a first CBR for a first beam to be used by asidelink receiver for receiving a sidelink transmission transmitted bythe sidelink transmitter, as described above. In some aspects, theper-beam CBR is a CBR that is specific to the beam to be used by thesidelink receiver for receiving the sidelink transmission.

As further shown in FIG. 7 , in some aspects, process 700 may includeselectively transmitting the sidelink transmission for reception by thesidelink receiver using the first beam based at least in part on theindication of the per-beam CBR (block 720). For example, the sidelinktransmitter (for example, using transmit processor 264controller/processor 280, memory 282) may selectively transmit thesidelink transmission for reception by the sidelink receiver using thefirst beam based at least in part on the indication of the per-beam CBR,as described above.

Process 700 may include additional aspects, such as any single aspect orany combination of aspects described below and/or in connection with oneor more other processes described elsewhere herein.

In a first aspect, the indication of the per-beam CBR is received fromthe sidelink receiver or from a base station configured to relay theindication of the per-beam CBR from the sidelink receiver.

In a second additional aspect, alone or in combination with the firstaspect, process 600 includes receiving a UE identifier of the sidelinkreceiver and a beam identifier of the per-beam CBR.

In a third additional aspect, alone or in combination with one or moreof the first and second aspects, the sidelink receiver is configured toperiodically measure and transmit the indication of the per-beam CBR,wherein a periodicity of the measurement of the per-beam CBR or thetransmission of the indication of the per-beam CBR depends on the beam.

In a fourth additional aspect, alone or in combination with one or moreof the first through third aspects, the sidelink transmitterperiodically receives the indication of the per-beam CBR, wherein aperiodicity of the reception of the indication of the per-beam CBRdepends on the beam.

In a fifth additional aspect, alone or in combination with one or moreof the first through fourth aspects, receiving the indication of theper-beam CBR associated with the beam comprises: determining informationidentifying a particular set of time-frequency resources as a set oftime-frequency resources that corresponds to the beam, and receiving theindication of the per-beam CBR in the particular set of time-frequencyresources that corresponds to the beam.

In a sixth additional aspect, alone or in combination with one or moreof the first through fifth aspects, the sidelink receiver and thesidelink transmitter have common timing.

In a seventh additional aspect, alone or in combination with one or moreof the first through sixth aspects, the per-beam CBR includes aplurality of CBRs for the first beam, each associated with a differentthreshold.

In an eighth additional aspect, alone or in combination with one or moreof the first through seventh aspects, the plurality of CBRs is a subsetof CBRs from another plurality of CBRs for the first beam.

In a ninth additional aspect, alone or in combination with one or moreof the first through eighth aspects, the subset of CBRs is based atleast in part on at least one of: an instruction received from a basestation, a priority of the sidelink transmission, or a priority of thesidelink transmitter.

In a tenth additional aspect, alone or in combination with one or moreof the first through ninth aspects, the first CBR is associated with athreshold selected for assessing busyness for a wide beam.

In an eleventh additional aspect, alone or in combination with one ormore of the first through tenth aspects, the first CBR is associatedwith a threshold selected for assessing busyness for a narrow beam.

In a twelfth additional aspect, alone or in combination with one or moreof the first through eleventh aspects, the per-beam CBR includes asecond CBR for a second beam, wherein the first CBR is associated with afirst threshold and the second CBR is associated with a second thresholdthat is different from the first threshold.

FIG. 8 is a diagram illustrating an example process 800 performed, forexample, by a sidelink receiver, in accordance with various aspects ofthe present disclosure. Example process 800 is an example where asidelink receiver (for example, UE 120) performs operations associatedwith beamformed CBR.

As shown in FIG. 8 , in some aspects, process 800 may include receivinga sidelink transmission transmitted by a sidelink transmitter (block810). For example, the sidelink receiver (for example, using receiveprocessor 258, controller/processor 280, memory 282) may receive asidelink transmission transmitted by a sidelink transmitter, asdescribed above.

As further shown in FIG. 8 , in some aspects, process 800 may includetransmitting a busy signal based at least in part on receiving thesidelink transmission from the sidelink transmitter (block 820). Forexample, the sidelink receiver (for example, using transmit processor264, controller/processor 280, memory 282) may transmit a busy signalbased at least in part on receiving the sidelink transmission from thesidelink transmitter, as described above. In some aspects, the busysignal indicates that a channel associated with the sidelinktransmission is busy or is occupied. In some aspects, the busy signal istransmitted in a time period during which the sidelink receiver isreceiving the sidelink transmission from the sidelink transmitter.

Process 800 may include additional aspects, such as any single aspect orany combination of aspects described below and/or in connection with oneor more other processes described elsewhere herein.

In a first aspect, a frequency of the busy signal indicates a frequencyband associated with the sidelink transmission.

In a second aspect, alone or in combination with the first aspect, acodeword or a sequence transmitted in the busy signal indicatesoccupancy of a set of resources of a frequency band associated with thesidelink transmission.

In a third aspect, alone or in combination with one or more of the firstand second aspects, a frequency band of the busy signal overlaps with afrequency band associated with the sidelink transmission.

In a fourth aspect, alone or in combination with one or more of thefirst through third aspects, the busy signal is frequency divisionmultiplexed with a frequency band associated with the sidelinktransmission.

In a fifth aspect, alone or in combination with one or more of the firstthrough fourth aspects, a beam or a panel on which the busy signal istransmitted is different from a beam or a panel on which the sidelinktransmission is being received.

In a sixth aspect, alone or in combination with one or more of the firstthrough fifth aspects, the busy signal is transmitted on multiple beamsor on multiple panels.

In a seventh aspect, alone or in combination with one or more of thefirst through sixth aspects, a beam on which the busy signal istransmitted has a different characteristic than the beam on which thesidelink transmission is received.

In an eighth aspect, alone or in combination with one or more of thefirst through seventh aspects, the busy signal indicates a receive beamused to receive the sidelink transmission. In some aspects, the receivebeam is identified with respect to a sidelink synchronization beam.

In a ninth aspect, alone or in combination with one or more of the firstthrough eighth aspects, the busy signal indicates a direction of areceive beam used to receive the sidelink transmission.

In a tenth aspect, alone or in combination with one or more of the firstthrough ninth aspects, the sidelink receiver and the sidelinktransmitter are UEs (for example, UEs 120).

In an eleventh aspect, alone or in combination with one or more of thefirst through tenth aspects, the sidelink receiver and the sidelinktransmitter are IAB nodes.

In a twelfth aspect, alone or in combination with one or more of thefirst through eleventh aspects, the busy signal indicates an identity ofthe sidelink receiver, such as a UE identifier.

FIG. 9 is a diagram illustrating an example process 900 performed, forexample, by a sidelink transmitter, in accordance with various aspectsof the present disclosure. Example process 900 is an example where asidelink transmitter (for example, UE 120) performs operationsassociated with beamformed CBR.

As shown in FIG. 9 , in some aspects, process 900 may include receivinga busy signal using a beam associated with a sidelink transmissionreceived by a sidelink receiver (block 910). For example, the sidelinktransmitter (for example, using receive processor 258,controller/processor 280, memory 282) may receive a busy signal using abeam associated with a sidelink transmission received by a sidelinkreceiver, as described above. In some aspects, the busy signal indicatesthat a channel associated with the sidelink transmission is busy or isoccupied. In some aspects, the busy signal is received in a time periodduring which the sidelink receiver is receiving the sidelinktransmission.

As further shown in FIG. 9 , in some aspects, process 900 may includeselectively transmitting, based at least in part on the busy signalassociated with the sidelink transmission, another sidelink transmissionto another sidelink receiver using the beam (block 920). For example,the sidelink transmitter (for example, using transmit processor 264,controller/processor 280, memory 282) may selectively transmit, based atleast in part on the busy signal associated with the sidelinktransmission, another sidelink transmission to another sidelink receiverusing the beam, as described above.

Process 900 may include additional aspects, such as any single aspect orany combination of aspects described below and/or in connection with oneor more other processes described elsewhere herein.

In a first aspect, a frequency of the busy signal indicates a frequencyband associated with the sidelink transmission.

In a second aspect, alone or in combination with the first aspect, acodeword or a sequence received in the busy signal indicates occupancyof a set of resources of a frequency band associated with the sidelinktransmission.

In a third aspect, alone or in combination with one or more of the firstand second aspects, a frequency band of the busy signal overlaps with afrequency band associated with the sidelink transmission.

In a fourth aspect, alone or in combination with one or more of thefirst through third aspects, the busy signal is frequency divisionmultiplexed with a frequency band associated with the sidelinktransmission.

In a fifth aspect, alone or in combination with one or more of the firstthrough fourth aspects, the busy signal indicates a receive beam used toreceive the sidelink transmission. In some aspects, the receive beam isidentified with respect to a sidelink synchronization beam.

In a sixth aspect, alone or in combination with one or more of the firstthrough fifth aspects, the busy signal indicates a direction of areceive beam used to receive the sidelink transmission.

In a seventh aspect, alone or in combination with one or more of thefirst through sixth aspects, the sidelink receiver, the other sidelinkreceiver, and the sidelink transmitter are UEs (for example, UEs 120).

In an eighth aspect, alone or in combination with one or more of thefirst through seventh aspects, the sidelink receiver, the other sidelinkreceiver, and the sidelink transmitter are IAB nodes.

In a ninth aspect, alone or in combination with one or more of the firstthrough eighth aspects, the busy signal indicates an identity of thesidelink receiver.

In a tenth aspect, alone or in combination with one or more of the firstthrough ninth aspects, a per-beam CBR for a receive beam to be used bythe other sidelink receiver for receiving the other sidelinktransmission from the sidelink transmitter is computed based at least inpart on the busy signal.

FIG. 10 is a diagram illustrating an example process 1000 performed, forexample, by a sidelink device, in accordance with various aspects of thepresent disclosure. Example process 1000 is an example where a sidelinkdevice (for example, UE 120) performs operations associated withbeamformed CBR.

As shown in FIG. 10 , in some aspects, process 1000 may includeidentifying a set of beams associated with communicating sidelinktransmissions (block 1010). For example, the sidelink device (forexample, using receive/transmit processor 258/264 controller/processor280, memory 282) may identify a set of beams associated withcommunicating sidelink transmissions, as described above.

As further shown in FIG. 10 , in some aspects, process 1000 may includedetermining a set of per-beam CBRs, each CBR corresponding to one of theset of beams (block 1020). For example, the sidelink device (forexample, using receive/transmit processor 258/264, controller/processor280, memory 282) may determine a set of per-beam CBRs, each CBRcorresponding to one of the set of beams, as described above.

FIG. 11 is a block diagram of an example apparatus 1100 for wirelesscommunication. The apparatus 1100 may be a sidelink receiver (forexample, a UE, a base station, an IAB node, or the like), or a sidelinkreceiver may include the apparatus 1100. In some aspects, the apparatus1100 includes a reception component 1102, a communication manager 1104,and a transmission component 1106, which may be in communication withone another (for example, via one or more buses). As shown, theapparatus 1100 may communicate with another apparatus 1108 (such as asidelink transmitter, which may include a UE, a base station, an IABnode, or another wireless communication device) using the receptioncomponent 1102 and the transmission component 1106.

In some aspects, the apparatus 1100 may be configured to perform one ormore operations described herein in connection with FIGS. 3 and 4 .Additionally or alternatively, the apparatus 1100 may be configured toperform one or more processes described herein, such as process 600 ofFIG. 6 . In some aspects, the apparatus 1100 may include one or morecomponents of the UE 120 described above in connection with FIG. 2 .

The reception component 1102 may receive communications, such asreference signals, control information, data communications, or acombination thereof, from the apparatus 1108. The reception component1102 may provide received communications to one or more other componentsof the apparatus 1100, such as the communication manager 1104. In someaspects, the reception component 1102 may perform signal processing onthe received communications (such as filtering, amplification,demodulation, analog-to-digital conversion, demultiplexing,deinterleaving, de-mapping, equalization, interference cancellation, ordecoding, among other examples), and may provide the processed signalsto the one or more other components. In some aspects, the receptioncomponent 1102 may include one or more antennas, a demodulator, a MIMOdetector, a receive processor, a controller/processor, a memory, or acombination thereof, of the sidelink receiver described above inconnection with FIG. 2 .

The transmission component 1106 may transmit communications, such asreference signals, control information, data communications, or acombination thereof, to the apparatus 1108. In some aspects, thecommunication manager 1104 may generate communications and may transmitthe generated communications to the transmission component 1106 fortransmission to the apparatus 1108. In some aspects, the transmissioncomponent 1106 may perform signal processing on the generatedcommunications (such as filtering, amplification, modulation,digital-to-analog conversion, multiplexing, interleaving, mapping, orencoding, among other examples), and may transmit the processed signalsto the apparatus 1108. In some aspects, the transmission component 1106may include one or more antennas, a modulator, a transmit MIMOprocessor, a transmit processor, a controller/processor, a memory, or acombination thereof, of the sidelink receiver described above inconnection with FIG. 2 . In some aspects, the transmission component1106 may be collocated with the reception component 1102 in atransceiver.

The communication manager 1104 may measure a per-beam CBR for each ofone or more beams configured on the sidelink receiver for transmittingor receiving sidelink transmissions including a first CBR for a firstbeam that is to be used for receiving a sidelink transmissiontransmitted by a first sidelink transmitter, and may transmit or maycause the transmission component 1106 to transmit an indication of theper-beam CBR for each of the one or more of the beams including thefirst CBR for the first beam. In some aspects, the communication manager1104 may include a controller/processor, a memory, a scheduler, acommunication unit, or a combination thereof, of the UE 120 or the basestation 110 described above in connection with FIG. 2 .

In some aspects, the communication manager 1104 may include a set ofcomponents, such as a per-beam CBR measurement component 1110.Alternatively, the set of components may be separate and distinct fromthe communication manager 1104. In some aspects, one or more componentsof the set of components may include or may be implemented within acontroller/processor, a memory, a scheduler, a communication unit, or acombination thereof, of the UE 120 or the base station 110 describedabove in connection with FIG. 2 . Additionally or alternatively, one ormore components of the set of components may be implemented at least inpart as software stored in a memory. For example, a component (or aportion of a component) may be implemented as instructions or codestored in a non-transitory computer-readable medium and executable by acontroller or a processor to perform the functions or operations of thecomponent.

The per-beam CBR measurement component 1110 may measure a per-beam CBRcorresponding to a beam to be used for receiving a sidelink transmissiontransmitted by a sidelink transmitter, as described herein. In someaspects, the transmission component 1106 may transmit indication of theper-beam CBR for each of the one or more of the beams including thefirst CBR for the first beam, as described herein.

The number and arrangement of components shown in FIG. 11 are providedas an example. In practice, there may be additional components, fewercomponents, different components, or differently arranged componentsthan those shown in FIG. 11 . Furthermore, two or more components shownin FIG. 11 may be implemented within a single component, or a singlecomponent shown in FIG. 11 may be implemented as multiple, distributedcomponents. Additionally or alternatively, a set of (one or more)components shown in FIG. 11 may perform one or more functions describedas being performed by another set of components shown in FIG. 11 .

FIG. 12 is a block diagram of an example apparatus 1200 for wirelesscommunication. The apparatus 1200 may be a sidelink transmitter (forexample, a UE 120, a base station 110, an IAB node, or the like), or asidelink transmitter may include the apparatus 1200. In some aspects,the apparatus 1200 includes a reception component 1202, a communicationmanager 1204, and a transmission component 1206, which may be incommunication with one another (for example, via one or more buses). Asshown, the apparatus 1200 may communicate with another apparatus 1208(such as a sidelink receiver, which may include a UE, a base station, anIAB node, or another wireless communication device) using the receptioncomponent 1202 and the transmission component 1206.

In some aspects, the apparatus 1200 may be configured to perform one ormore operations described herein in connection with FIGS. 3 and 4 .Additionally or alternatively, the apparatus 1200 may be configured toperform one or more processes described herein, such as process 700 ofFIG. 7 . In some aspects, the apparatus 1200 may include one or morecomponents of the UE 120 or the base station 110 described above inconnection with FIG. 2 .

The reception component 1202 may receive communications, such asreference signals, control information, data communications, or acombination thereof, from the apparatus 1208. The reception component1202 may provide received communications to one or more other componentsof the apparatus 1200, such as the communication manager 1204. In someaspects, the reception component 1202 may perform signal processing onthe received communications (such as filtering, amplification,demodulation, analog-to-digital conversion, demultiplexing,deinterleaving, de-mapping, equalization, interference cancellation, ordecoding, among other examples), and may provide the processed signalsto the one or more other components. In some aspects, the receptioncomponent 1202 may include one or more antennas, a demodulator, a MIMOdetector, a receive processor, a controller/processor, a memory, or acombination thereof, of the sidelink transmitter described above inconnection with FIG. 2 .

The transmission component 1206 may transmit communications, such asreference signals, control information, data communications, or acombination thereof, to the apparatus 1208. In some aspects, thecommunication manager 1204 may generate communications and may transmitthe generated communications to the transmission component 1206 fortransmission to the apparatus 1208. In some aspects, the transmissioncomponent 1206 may perform signal processing on the generatedcommunications (such as filtering, amplification, modulation,digital-to-analog conversion, multiplexing, interleaving, mapping, orencoding, among other examples), and may transmit the processed signalsto the apparatus 1208. In some aspects, the transmission component 1206may include one or more antennas, a modulator, a transmit MIMOprocessor, a transmit processor, a controller/processor, a memory, or acombination thereof, of the sidelink transmitter described above inconnection with FIG. 2 . In some aspects, the transmission component1206 may be collocated with the reception component 1202 in atransceiver.

The communication manager 1204 may receive an indication of a per-beamCBR including a first CBR for a first beam to be used by a sidelinkreceiver for receiving a sidelink transmission transmitted by thesidelink transmitter, and may selectively transmit or may causetransmission component 1206 to selectively transmit the sidelinktransmission for reception by sidelink receiver using the first beambased at least in part on the indication of the per-beam CBR. In someaspects, the communication manager 1204 may include acontroller/processor, a memory, a scheduler, a communication unit, or acombination thereof, of the UE 120 or the base station 110 describedabove in connection with FIG. 2 .

In some aspects, the communication manager 1204 may include a set ofcomponents, such as a selective transmission component 1210.Alternatively, the set of components may be separate and distinct fromthe communication manager 1204. In some aspects, one or more componentsof the set of components may include or may be implemented within acontroller/processor, a memory, a scheduler, a communication unit, or acombination thereof, of the UE 120 or the base station 110 describedabove in connection with FIG. 2 . Additionally or alternatively, one ormore components of the set of components may be implemented at least inpart as software stored in a memory. For example, a component (or aportion of a component) may be implemented as instructions or codestored in a non-transitory computer-readable medium and executable by acontroller or a processor to perform the functions or operations of thecomponent.

In some aspects, the reception component 1202 may receive an indicationof a a per-beam CBR including a first CBR for a first beam to be used bya sidelink receiver for receiving a sidelink transmission transmitted bythe sidelink transmitter, as described herein. In some aspects, theselective transmission component 1210 may selectively transmit thesidelink transmission for reception by sidelink receiver using the firstbeam based at least in part on the indication of the per-beam CBR, asdescribed herein.

The number and arrangement of components shown in FIG. 12 are providedas an example. In practice, there may be additional components, fewercomponents, different components, or differently arranged componentsthan those shown in FIG. 12 . Furthermore, two or more components shownin FIG. 12 may be implemented within a single component, or a singlecomponent shown in FIG. 12 may be implemented as multiple, distributedcomponents. Additionally or alternatively, a set of (one or more)components shown in FIG. 12 may perform one or more functions describedas being performed by another set of components shown in FIG. 12 .

FIG. 13 is a block diagram of an example apparatus 1300 for wirelesscommunication. The apparatus 1300 may be a sidelink receiver (forexample, a UE 120, a base station 110, an IAB node, or the like), or asidelink receiver may include the apparatus 1300. In some aspects, theapparatus 1300 includes a reception component 1302, a communicationmanager 1304, and a transmission component 1306, which may be incommunication with one another (for example, via one or more buses). Asshown, the apparatus 1300 may communicate with another apparatus 1308(such as a sidelink transmitter, which may include a UE, a base station,an IAB node, or another wireless communication device) using thereception component 1302 and the transmission component 1306.

In some aspects, the apparatus 1300 may be configured to perform one ormore operations described herein in connection with FIG. 5 .Additionally or alternatively, the apparatus 1300 may be configured toperform one or more processes described herein, such as process 800 ofFIG. 8 . In some aspects, the apparatus 1300 may include one or morecomponents of the UE 120 or the base station 110 described above inconnection with FIG. 2 .

The reception component 1302 may receive communications, such asreference signals, control information, data communications, or acombination thereof, from the apparatus 1308. The reception component1302 may provide received communications to one or more other componentsof the apparatus 1300, such as the communication manager 1304. In someaspects, the reception component 1302 may perform signal processing onthe received communications (such as filtering, amplification,demodulation, analog-to-digital conversion, demultiplexing,deinterleaving, de-mapping, equalization, interference cancellation, ordecoding, among other examples), and may provide the processed signalsto the one or more other components. In some aspects, the receptioncomponent 1302 may include one or more antennas, a demodulator, a MIMOdetector, a receive processor, a controller/processor, a memory, or acombination thereof, of the sidelink receiver described above inconnection with FIG. 2 .

The transmission component 1306 may transmit communications, such asreference signals, control information, data communications, or acombination thereof, to the apparatus 1308. In some aspects, thecommunication manager 1304 may generate communications and may transmitthe generated communications to the transmission component 1306 fortransmission to the apparatus 1308. In some aspects, the transmissioncomponent 1306 may perform signal processing on the generatedcommunications (such as filtering, amplification, modulation,digital-to-analog conversion, multiplexing, interleaving, mapping, orencoding, among other examples), and may transmit the processed signalsto the apparatus 1308. In some aspects, the transmission component 1306may include one or more antennas, a modulator, a transmit MIMOprocessor, a transmit processor, a controller/processor, a memory, or acombination thereof, of the sidelink receiver described above inconnection with FIG. 2 . In some aspects, the transmission component1306 may be collocated with the reception component 1302 in atransceiver.

The communication manager 1304 may receive or may cause receptioncomponent 1302 to receive a sidelink transmission transmitted by asidelink transmitter, and may transmit busy signal while receiving thesidelink transmission from the sidelink transmitter. In some aspects,the communication manager 1304 may include a controller/processor, amemory, a scheduler, a communication unit, or a combination thereof, ofthe UE 120 or the base station 110 described above in connection withFIG. 2 .

In some aspects, the communication manager 1304 may include a set ofcomponents, such as a busy signal transmission component 1310.Alternatively, the set of components may be separate and distinct fromthe communication manager 1304. In some aspects, one or more componentsof the set of components may include or may be implemented within acontroller/processor, a memory, a scheduler, a communication unit, or acombination thereof, of the UE 120 or the base station 110 describedabove in connection with FIG. 2 . Additionally or alternatively, one ormore components of the set of components may be implemented at least inpart as software stored in a memory. For example, a component (or aportion of a component) may be implemented as instructions or codestored in a non-transitory computer-readable medium and executable by acontroller or a processor to perform the functions or operations of thecomponent.

In some aspects, the reception component 1302 may receive a sidelinktransmission transmitted by a sidelink transmitter, as described herein.In some aspects, the busy signal transmission component 1310 maytransmit or may cause the transmission component 1306 to transmit a busysignal while the reception component 1302 is receiving the sidelinktransmission from the sidelink transmitter, as described herein.

The number and arrangement of components shown in FIG. 13 are providedas an example. In practice, there may be additional components, fewercomponents, different components, or differently arranged componentsthan those shown in FIG. 13 . Furthermore, two or more components shownin FIG. 13 may be implemented within a single component, or a singlecomponent shown in FIG. 13 may be implemented as multiple, distributedcomponents. Additionally or alternatively, a set of (one or more)components shown in FIG. 13 may perform one or more functions describedas being performed by another set of components shown in FIG. 13 .

FIG. 14 is a block diagram of an example apparatus 1400 for wirelesscommunication. The apparatus 1400 may be a sidelink transmitter (forexample, a UE 120, a base station 110, an IAB node, or the like), or asidelink transmitter may include the apparatus 1400. In some aspects,the apparatus 1400 includes a reception component 1402, a communicationmanager 1404, and a transmission component 1406, which may be incommunication with one another (for example, via one or more buses). Asshown, the apparatus 1400 may communicate with another apparatus 1408(such as a sidelink receiver, which may include a UE, a base station, anIAB node, or another wireless communication device) using the receptioncomponent 1402 and the transmission component 1406.

In some aspects, the apparatus 1400 may be configured to perform one ormore operations described herein in connection with FIG. 5 .Additionally or alternatively, the apparatus 1400 may be configured toperform one or more processes described herein, such as process 900 ofFIG. 9 . In some aspects, the apparatus 1400 may include one or morecomponents of the UE 120 or the base station 110 described above inconnection with FIG. 2 .

The reception component 1402 may receive communications, such asreference signals, control information, data communications, or acombination thereof, from the apparatus 1408. The reception component1402 may provide received communications to one or more other componentsof the apparatus 1400, such as the communication manager 1404. In someaspects, the reception component 1402 may perform signal processing onthe received communications (such as filtering, amplification,demodulation, analog-to-digital conversion, demultiplexing,deinterleaving, de-mapping, equalization, interference cancellation, ordecoding, among other examples), and may provide the processed signalsto the one or more other components. In some aspects, the receptioncomponent 1402 may include one or more antennas, a demodulator, a MIMOdetector, a receive processor, a controller/processor, a memory, or acombination thereof, of the sidelink transmitter described above inconnection with FIG. 2 .

The transmission component 1406 may transmit communications, such asreference signals, control information, data communications, or acombination thereof, to the apparatus 1408. In some aspects, thecommunication manager 1404 may generate communications and may transmitthe generated communications to the transmission component 1406 fortransmission to the apparatus 1408. In some aspects, the transmissioncomponent 1406 may perform signal processing on the generatedcommunications (such as filtering, amplification, modulation,digital-to-analog conversion, multiplexing, interleaving, mapping, orencoding, among other examples), and may transmit the processed signalsto the apparatus 1408. In some aspects, the transmission component 1406may include one or more antennas, a modulator, a transmit MIMOprocessor, a transmit processor, a controller/processor, a memory, or acombination thereof, of the sidelink transmitter described above inconnection with FIG. 2 . In some aspects, the transmission component1406 may be collocated with the reception component 1402 in atransceiver.

The communication manager 1404 may receive or may cause receptioncomponent 1402 to receive a busy signal using a beam associated with asidelink transmission received by a sidelink receiver, and mayselectively transmit or may cause transmission component 1406 toselectively transmit, based at least in part on the busy signalassociated with the sidelink transmission, another sidelink transmissionto another sidelink receiver using the beam. In some aspects, thecommunication manager 1404 may include a controller/processor, a memory,a scheduler, a communication unit, or a combination thereof, of the UE120 or the base station 110 described above in connection with FIG. 2 .

In some aspects, the communication manager 1404 may include a set ofcomponents, such as a selective transmission component 1410.Alternatively, the set of components may be separate and distinct fromthe communication manager 1404. In some aspects, one or more componentsof the set of components may include or may be implemented within acontroller/processor, a memory, a scheduler, a communication unit, or acombination thereof, of the UE 120 or the base station 110 describedabove in connection with FIG. 2 . Additionally or alternatively, one ormore components of the set of components may be implemented at least inpart as software stored in a memory. For example, a component (or aportion of a component) may be implemented as instructions or codestored in a non-transitory computer-readable medium and executable by acontroller or a processor to perform the functions or operations of thecomponent.

In some aspects, the reception component 1402 may receive a busy signalusing a beam associated with a sidelink transmission received by asidelink receiver, as described herein. In some aspects, the selectivetransmission component 1410 may selectively transmit, based at least inpart on the busy signal associated with the sidelink transmission,another sidelink transmission to another sidelink receiver using thebeam, as described herein.

The number and arrangement of components shown in FIG. 14 are providedas an example. In practice, there may be additional components, fewercomponents, different components, or differently arranged componentsthan those shown in FIG. 14 . Furthermore, two or more components shownin FIG. 14 may be implemented within a single component, or a singlecomponent shown in FIG. 14 may be implemented as multiple, distributedcomponents. Additionally or alternatively, a set of (one or more)components shown in FIG. 14 may perform one or more functions describedas being performed by another set of components shown in FIG. 14 .

FIG. 15 is a block diagram of an example apparatus 1500 for wirelesscommunication. The apparatus 1500 may be a sidelink device (for example,a sidelink receiver or a sidelink transmitter, either of which mayinclude a UE 120, a base station 110, an IAB node, or the like), or asidelink device may include the apparatus 1500. In some aspects, theapparatus 1500 includes a reception component 1502, a communicationmanager 1504, and a transmission component 1506, which may be incommunication with one another (for example, via one or more buses). Asshown, the apparatus 1500 may communicate with another apparatus 1508(such as another sidelink device, which may include a UE, a basestation, an IAB node, or another wireless communication device) usingthe reception component 1502 and the transmission component 1506.

In some aspects, the apparatus 1500 may be configured to perform one ormore operations described herein in connection with FIGS. 3-5 .Additionally or alternatively, the apparatus 1500 may be configured toperform one or more processes described herein, such as process 1000 ofFIG. 10 . In some aspects, the apparatus 1500 may include one or morecomponents of the UE 120 or the base station 110 described above inconnection with FIG. 2 .

The reception component 1502 may receive communications, such asreference signals, control information, data communications, or acombination thereof, from the apparatus 1508. The reception component1502 may provide received communications to one or more other componentsof the apparatus 1500, such as the communication manager 1504. In someaspects, the reception component 1502 may perform signal processing onthe received communications (such as filtering, amplification,demodulation, analog-to-digital conversion, demultiplexing,deinterleaving, de-mapping, equalization, interference cancellation, ordecoding, among other examples), and may provide the processed signalsto the one or more other components. In some aspects, the receptioncomponent 1502 may include one or more antennas, a demodulator, a MIMOdetector, a receive processor, a controller/processor, a memory, or acombination thereof, of the sidelink device described above inconnection with FIG. 2 .

The transmission component 1506 may transmit communications, such asreference signals, control information, data communications, or acombination thereof, to the apparatus 1508. In some aspects, thecommunication manager 1504 may generate communications and may transmitthe generated communications to the transmission component 1506 fortransmission to the apparatus 1508. In some aspects, the transmissioncomponent 1506 may perform signal processing on the generatedcommunications (such as filtering, amplification, modulation,digital-to-analog conversion, multiplexing, interleaving, mapping, orencoding, among other examples), and may transmit the processed signalsto the apparatus 1508. In some aspects, the transmission component 1506may include one or more antennas, a modulator, a transmit MIMOprocessor, a transmit processor, a controller/processor, a memory, or acombination thereof, of the sidelink device described above inconnection with FIG. 2 . In some aspects, the transmission component1506 may be collocated with the reception component 1502 in atransceiver.

The communication manager 1504 may identify a set of beams associatedwith communicating sidelink transmissions, and may determine a set ofper-beam CBRs, each CBR corresponding to one of the set of beams. Insome aspects, the communication manager 1504 may include acontroller/processor, a memory, a scheduler, a communication unit, or acombination thereof, of the UE 120 or the base station 110 describedabove in connection with FIG. 2 .

In some aspects, the communication manager 1504 may include a set ofcomponents, such as an identification component 1510, a determinationcomponent 1512, or a combination thereof. Alternatively, the set ofcomponents may be separate and distinct from the communication manager1504. In some aspects, one or more components of the set of componentsmay include or may be implemented within a controller/processor, amemory, a scheduler, a communication unit, or a combination thereof, ofthe UE 120 or the base station 110 described above in connection withFIG. 2 . Additionally or alternatively, one or more components of theset of components may be implemented at least in part as software storedin a memory. For example, a component (or a portion of a component) maybe implemented as instructions or code stored in a non-transitorycomputer-readable medium and executable by a controller or a processorto perform the functions or operations of the component.

In some aspects, the identification component 1510 may identify a set ofbeams associated with communicating sidelink transmissions, as describedherein. In some aspects, the determination component 1512 may determinea set of per-beam CBRs, each CBR corresponding to one of the set ofbeams, as described herein.

The number and arrangement of components shown in FIG. 15 are providedas an example. In practice, there may be additional components, fewercomponents, different components, or differently arranged componentsthan those shown in FIG. 15 . Furthermore, two or more components shownin FIG. 15 may be implemented within a single component, or a singlecomponent shown in FIG. 15 may be implemented as multiple, distributedcomponents. Additionally or alternatively, a set of (one or more)components shown in FIG. 15 may perform one or more functions describedas being performed by another set of components shown in FIG. 15 .

The foregoing disclosure provides illustration and description, but isnot intended to be exhaustive or to limit the aspects to the preciseform disclosed. Modifications and variations may be made in light of theabove disclosure or may be acquired from practice of the aspects.

As used herein, the term “component” is intended to be broadly construedas hardware, firmware, or a combination of hardware and software. Asused herein, a processor is implemented in hardware, firmware, or acombination of hardware and software.

Some aspects are described herein in connection with thresholds. As usedherein, satisfying a threshold may refer to a value being greater thanthe threshold, greater than or equal to the threshold, less than thethreshold, less than or equal to the threshold, equal to the threshold,not equal to the threshold, or the like, or combinations thereof.

It will be apparent that systems or methods described herein may beimplemented in different forms of hardware, firmware, or a combinationof hardware and software. The actual specialized control hardware orsoftware code used to implement these systems or methods is not limitingof the aspects. Thus, the operation and behavior of the systems ormethods were described herein without reference to specific softwarecode—it being understood that software and hardware can be designed toimplement the systems or methods based, at least in part, on thedescription herein.

Even though particular combinations of features are recited in theclaims or disclosed in the specification, these combinations are notintended to limit the disclosure of various aspects. In fact, many ofthese features may be combined in ways not specifically recited in theclaims or disclosed in the specification. Although each dependent claimlisted below may directly depend on only one claim, the disclosure ofvarious aspects includes each dependent claim in combination with everyother claim in the claim set. A phrase referring to “at least one of” alist of items refers to any combination of those items, including singlemembers. As an example, “at least one of: a, b, or c” is intended tocover a, b, c, a-b, a-c, b-c, and a-b-c, as well as any combination withmultiples of the same element (for example, a-a, a-a-a, a-a-b, a-a-c,a-b-b, a-c-c, b-b, b-b-b, b-b-c, c-c, and c-c-c or any other ordering ofa, b, and c).

No element, act, or instruction used herein is to be construed ascritical or essential unless explicitly described as such. Also, as usedherein, the articles “a” and “an” are intended to include one or moreitems, and may be used interchangeably with “one or more.” Furthermore,as used herein, the terms “set” and “group” are intended to include oneor more items (for example, related items, unrelated items, acombination of related and unrelated items, or the like, or combinationsthereof), and may be used interchangeably with “one or more.” Where onlyone item is intended, the phrase “only one” or similar language is used.Also, as used herein, the terms “has,” “have,” “having,” or the like, orcombinations thereof are intended to be open-ended terms. Further, thephrase “based on” is intended to mean “based, at least in part, on”unless explicitly stated otherwise.

What is claimed is:
 1. A method of wireless communication performed by asidelink receiver, comprising: receiving a sidelink transmission from afirst sidelink transmitter; and transmitting a busy signal to a secondsidelink transmitter while receiving the sidelink transmission from thefirst sidelink transmitter, the busy signal indicating that a channelassociated with the sidelink transmission is busy or is occupied, and afrequency of the busy signal indicating a frequency band associated withthe sidelink transmission.
 2. The method of claim 1, wherein a codewordor a sequence transmitted in the busy signal indicates occupancy of aset of resources of the frequency band associated with the sidelinktransmission.
 3. The method of claim 1, wherein a frequency band of thebusy signal overlaps with the frequency band associated with thesidelink transmission.
 4. The method of claim 1, wherein the busy signalis frequency division multiplexed with the frequency band associatedwith the sidelink transmission.
 5. The method of claim 1, wherein a beamor a panel on which the busy signal is transmitted is different from abeam or a panel on which the sidelink transmission is being received. 6.The method of claim 1, wherein the busy signal is transmitted onmultiple beams or on multiple panels.
 7. The method of claim 1, whereina beam on which the busy signal is transmitted has a differentcharacteristic than the beam on which the sidelink transmission isreceived.
 8. The method of claim 1, wherein the busy signal indicates areceive beam used to receive the sidelink transmission, and wherein thereceive beam is identified with respect to a sidelink synchronizationbeam.
 9. The method of claim 1, wherein the busy signal indicates adirection of a receive beam used to receive the sidelink transmission.10. The method of claim 1, wherein the busy signal indicates an identityof the sidelink receiver.
 11. A method of wireless communicationperformed by a sidelink transmitter, comprising: receiving a busy signalusing a beam associated with a first sidelink transmission received by afirst sidelink receiver, the busy signal indicating that a channelassociated with the first sidelink transmission is busy or is occupied,the busy signal being received in a time period during which the firstsidelink receiver is receiving the first sidelink transmission, and afrequency of the busy signal indicating a frequency band associated withthe first sidelink transmission; and selectively transmitting, based atleast in part on the busy signal, a second sidelink transmission tosecond sidelink receiver using the beam.
 12. The method of claim 11,wherein a codeword or a sequence received in the busy signal indicatesoccupancy of a set of resources of the frequency band associated withthe first sidelink transmission.
 13. The method of claim 11, wherein afrequency band of the busy signal overlaps with the frequency bandassociated with the first sidelink transmission.
 14. The method of claim11, wherein the busy signal is frequency division multiplexed with thefrequency band associated with the first sidelink transmission.
 15. Themethod of claim 11, wherein the busy signal indicates a receive beamused to receive the first sidelink transmission, and wherein the receivebeam is identified with respect to a sidelink synchronization beam. 16.The method of claim 11, wherein the busy signal indicates a direction ofa receive beam used to receive the first sidelink transmission.
 17. Themethod of claim 11, wherein the busy signal indicates an identity of thefirst sidelink receiver.
 18. The method of claim 11, wherein a per-beamchannel busy ratio (CBR) for a receive beam to be used by the secondsidelink receiver for receiving the second sidelink transmission fromthe sidelink transmitter is computed based at least in part on the busysignal.
 19. A sidelink receiver for wireless communication, comprising:at least one memory; and at least one processor communicatively coupledwith the at least one memory, the at least one processor operable tocause the sidelink receiver to: receive a sidelink transmission from afirst sidelink transmitter; and transmit a busy signal to a secondsidelink transmitter while receiving the sidelink transmission from thefirst sidelink transmitter, the busy signal indicating that a channelassociated with the sidelink transmission is busy or is occupied, and afrequency of the busy signal indicating a frequency band associated withthe sidelink transmission.
 20. The sidelink receiver of claim 19,wherein a codeword or a sequence transmitted in the busy signalindicates occupancy of a set of resources of the frequency bandassociated with the sidelink transmission.
 21. The sidelink receiver ofclaim 19, wherein a frequency band of the busy signal overlaps with thefrequency band associated with the sidelink transmission.
 22. Thesidelink receiver of claim 19, wherein the busy signal is frequencydivision multiplexed with the frequency band associated with thesidelink transmission.
 23. The sidelink receiver of claim 19, wherein abeam or a panel on which the busy signal is transmitted is differentfrom a beam or a panel on which the sidelink transmission is beingreceived.
 24. The sidelink receiver of claim 19, wherein the busy signalis transmitted on multiple beams or on multiple panels.
 25. A sidelinktransmitter for wireless communication, comprising: at least one memory;and at least one processor communicatively coupled with the at least onememory, the at least one processor operable to cause the sidelinktransmitter to: receive a busy signal using a beam associated with afirst sidelink transmission received by a first sidelink receiver, thebusy signal indicating that a channel associated with the first sidelinktransmission is busy or is occupied, the busy signal being received in atime period during which the first sidelink receiver is receiving thefirst sidelink transmission, and a frequency of the busy signalindicating a frequency band associated with the first sidelinktransmission; and selectively transmit, based at least in part on thebusy signal, a second sidelink transmission to second sidelink receiverusing the beam.
 26. The sidelink transmitter of claim 25, wherein acodeword or a sequence received in the busy signal indicates occupancyof a set of resources of the frequency band associated with the firstsidelink transmission.
 27. The sidelink transmitter of claim 25, whereina frequency band of the busy signal overlaps with the frequency bandassociated with the first sidelink transmission.
 28. The sidelinktransmitter of claim 25, wherein the busy signal is frequency divisionmultiplexed with the frequency band associated with the first sidelinktransmission.
 29. The sidelink transmitter of claim 25, wherein the busysignal indicates a receive beam used to receive the first sidelinktransmission, and wherein the receive beam is identified with respect toa sidelink synchronization beam.
 30. The sidelink transmitter of claim25, wherein the busy signal indicates a direction of a receive beam usedto receive the first sidelink transmission.